| 101 | H & D Exploration LLC | Hoisington, KS 67544 | Oil & Gas Operator | Dec 2025 |
| 102 | Halliburton Oil | | Oil & Gas Operator | Sep 2008 |
| 103 | Halliburton Oil Producing Co. | Duncan, OK 73534 | Oil & Gas Operator | Apr 2016 |
| 104 | Hallwood Petrole | | Oil & Gas Operator | Apr 1999 |
| 105 | Hallwood Petroleum, Inc. | Midland, TX 79701 | Oil & Gas Operator | Oct 2025 |
| 106 | Hartman Oil Company Inc | Wichita, KS 67206 | Oil & Gas Operator | Dec 2025 |
| 107 | Hellar Drilling Company, Inc. | Wichita, KS 67208 | Oil & Gas Operator | Jan 2009 |
| 108 | Herman L. Loeb LLC | Lawrenceville, IL 62439 | Oil & Gas Operator | Dec 2025 |
| 109 | HG Oil Holdings, LLC | Hoisington, KS 67544 | Oil & Gas Operator | Dec 2025 |
| 110 | Hilliker Production | Indian Wells, CA 92210 | Oil & Gas Operator | Jul 2007 |
| 111 | Himco Oil & Gas Inc | Enid, OK 73702 | Oil & Gas Operator | Jan 2026 |
| 112 | Hinkle Oil Compa | | Oil & Gas Operator | Nov 1994 |
| 113 | Hinkle Oil Company | Wichita, KS 67202 | Oil & Gas Operator | Jan 1999 |
| 114 | Hummon Corp | Medicine Lodge, KS 67104 | Oil & Gas Operator | Apr 2023 |
| 115 | Hupfer Oil & Gas | Hays, KS 67601 | Oil & Gas Operator | Dec 1993 |
| 116 | Hutchinson Oil Co. | | Oil & Gas Operator | Dec 2025 |
| 117 | Imperial Oil Com | | Oil & Gas Operator | Dec 1992 |
| 118 | Imperial Oil Properties, Inc. | Wichita, KS 67201 | Oil & Gas Operator | Jun 2006 |
| 119 | Indian Oil Company | Gainesville, TX 76241 | Oil & Gas Operator | Apr 2026 |
| 120 | Interior Oil Corporation | Derby, KS 67037 | Oil & Gas Operator | Jan 2023 |
| 121 | Iuka-Carmi Development LLC | Pratt, KS 67124 | Oil & Gas Operator | Dec 2025 |
| 122 | J & D Investment Co. | | Oil & Gas Operator | Dec 2025 |
| 123 | Jaguar Petroleum | | Oil Operator | Jul 1994 |
| 124 | Jason Oil Company, LLC | Russell, KS 67665 | Oil Operator | Dec 2025 |
| 125 | Jay Boy Oil Inco | | Oil & Gas Operator | May 1992 |
| 126 | Jel Resources LLC | Castle Rock, CO 80109 | Oil & Gas Operator | Dec 2025 |
| 127 | Jones Oil, LLC | St John, KS 67576 | Oil & Gas Operator | Dec 2025 |
| 128 | K & E Petroleum | | Oil & Gas Operator | Jan 1995 |
| 129 | Kachina Oil Comp | | Oil & Gas Operator | Jan 1988 |
| 130 | Kaiser-Francis Oil Company | Tulsa, OK 74121 | Oil & Gas Operator | Apr 2026 |
| 131 | Kansas Crude Investments LLC | Hays, KS 67601 | Oil Operator | Dec 2025 |
| 132 | Kansas Petroleum | | Oil & Gas Operator | Dec 1993 |
| 133 | Key Gas Corp. | Wichita, KS 67202 | Oil & Gas Operator | Nov 2018 |
| 134 | Kirkman W L Inco | | Oil & Gas Operator | Dec 1994 |
| 135 | KLM Operating | | Oil & Gas Operator | Mar 2025 |
| 136 | Kodiak Petroleum Inc | Englewood, CO 80155 | Oil & Gas Operator | Dec 2025 |
| 137 | Kytex, Inc. | Wichita, KS 67230 | Oil Operator | Dec 2019 |
| 138 | L. D. Drilling, Inc. | Great Bend, KS 67530 | Oil & Gas Operator | Dec 2025 |
| 139 | Lario Oil & Gas | | Oil & Gas Operator | Nov 1995 |
| 140 | Lauck D R Oil Co | | Oil & Gas Operator | Oct 1995 |
| 141 | Leben Drilling I | | Oil & Gas Operator | Dec 1988 |
| 142 | Leben Oil Corpor | | Oil & Gas Operator | Apr 1991 |
| 143 | Lebsack Oil Prod | | Oil & Gas Operator | Nov 1995 |
| 144 | M.A. Yost Operations, Inc | Russell, KS 67665 | Oil Operator | Dec 2025 |
| 145 | Mad Operators LLC | | Oil & Gas Operator | Dec 2025 |
| 146 | Magnum Oil & Gas | Flower Mound, TX 75028 | Oil & Gas Operator | Jul 2000 |
| 147 | Mai Oil Operations, Inc. | Dallas, TX 75225 | Oil & Gas Operator | Dec 2025 |
| 148 | Manuel Corporation | Wichita, KS 67206 | Oil & Gas Operator | Feb 2026 |
| 149 | Mar-Lou Oil Co., LLC | Wilson, KS 67490 | Oil Operator | Dec 2025 |
| 150 | Marco Oil Compan | | Oil & Gas Operator | Aug 1992 |
| 151 | Martin J S Oil O | | Oil & Gas Operator | Apr 1991 |
| 152 | Messenger Petroleum, Inc. | Kingman, KS 67068 | Oil & Gas Operator | Dec 2025 |
| 153 | Messman Corporation | Wichita, KS 67208 | Oil & Gas Operator | Dec 2025 |
| 154 | Messman-Rinehart | | Oil & Gas Operator | Mar 1991 |
| 155 | Meyer Douglas P | Longmont, CO 80501 | Oil & Gas Operator | Aug 2006 |
| 156 | Mid Kansas Gas Gathering | | Gas Operator | Dec 2025 |
| 157 | Mid-Continent Energy Corp. | Wichita, KS 67208 | Oil & Gas Operator | Dec 2025 |
| 158 | Migwis | Great Bend, KS 67530 | Oil Operator | Mar 1988 |
| 159 | Mobil Oil Corpor | | Oil & Gas Operator | Dec 1996 |
| 160 | Monarch Energy C | | Oil Operator | Nov 1987 |
| 161 | Murfin Drilling | | Oil & Gas Operator | Jul 1997 |
| 162 | Murfin Drilling Company, Inc. | Wichita, KS 67202 | Oil & Gas Operator | Feb 2026 |
| 163 | MW Oil, Inc | | Oil & Gas Operator | Dec 2025 |
| 164 | Nash Oil & Gas, Inc. | Newton, KS 67114 | Oil & Gas Operator | Dec 2025 |
| 165 | National Coopera | | Oil & Gas Operator | Mar 1992 |
| 166 | National Develop | | Oil & Gas Operator | Jan 1990 |
| 167 | Nec Operating - Kansas, LLC | Southlake, TX 76092 | Oil & Gas Operator | Dec 2025 |
| 168 | Northern Gas Pro | | Gas Operator | Jun 1994 |
| 169 | Northstar Investments, Inc. | Wichita, KS 67230 | Oil & Gas Operator | Dec 2025 |
| 170 | Nuss Oil Operations | | Oil & Gas Operator | Aug 1998 |
| 171 | Nuss, Fred J. | Hoisington, KS 67544 | Gas Operator | Dec 2025 |
| 172 | Oil Producers In | | Oil & Gas Operator | Dec 1996 |
| 173 | Oil Producers, Inc. Of Kansas | Wichita, KS 67206 | Oil & Gas Operator | Apr 2026 |
| 174 | Oil Prop Company | | Oil & Gas Operator | Sep 1995 |
| 175 | Oxy USA Inc | Houston, TX 77046 | Oil & Gas Operator | Apr 2026 |
| 176 | Palomino Petrole | | Oil & Gas Operator | Dec 1995 |
| 177 | Palomino Petroleum | Newton, KS 67114 | Oil Operator | Oct 2003 |
| 178 | Parrish Corporation | Wichita, KS 67202 | Oil & Gas Operator | Jan 2025 |
| 179 | Patterson Energy LLC | Hays, KS 67601 | Oil & Gas Operator | Dec 2025 |
| 180 | Peak Operating LLC | Oklahoma City, OK 73157 | Oil & Gas Operator | Dec 2025 |
| 181 | Petro Dynamics C | | Oil & Gas Operator | Sep 1988 |
| 182 | Petro Locators I | | Oil & Gas Operator | Dec 1995 |
| 183 | Petro Locators, Inc. | Pratt, KS 67124 | Oil & Gas Operator | Dec 2025 |
| 184 | Petroleum Energy | | Oil & Gas Operator | Mar 1991 |
| 185 | Petroleum Incorp | | Oil & Gas Operator | Apr 1993 |
| 186 | Phillips Petrole | | Oil & Gas Operator | May 1995 |
| 187 | Pickrell Drilling Co., Inc. | Wichita, KS 67213 | Oil & Gas Operator | Dec 2025 |
| 188 | Pintail Petroleu | | Oil & Gas Operator | Dec 1995 |
| 189 | Pintail Petroleum, LTD. | Wichita, KS 67202 | Oil & Gas Operator | Apr 2021 |
| 190 | Pratt Well Servi | | Oil & Gas Operator | Jul 1996 |
| 191 | Prolific Resources LLC | Wichita, KS 67208 | Oil & Gas Operator | Dec 2025 |
| 192 | R J Operating Company | Albany, TX 76430 | Oil & Gas Operator | Dec 2025 |
| 193 | Rains & Williams | | Oil & Gas Operator | Nov 1995 |
| 194 | Rains & Williamson Oil Co Inc | Wichita, KS 67277 | Oil & Gas Operator | Dec 2025 |
| 195 | Rama Operating Company Inc | Stafford, KS 67578 | Oil & Gas Operator | Feb 2026 |
| 196 | Raydon Exploration, Inc. | Oklahoma City, OK 73118 | Oil & Gas Operator | Apr 2026 |
| 197 | Redboot Production, Inc | Stafford, KS 67578 | Gas Operator | Jan 2017 |
| 198 | Reif Oil Operati | | Oil Operator | Nov 1988 |
| 199 | Renegade Resources Corp. | Reno, NV 89511 | Oil & Gas Operator | Jul 2024 |
| 200 | Richlan Drilling, A General Partnership | Beaver, KS 67525 | Oil & Gas Operator | Dec 2025 |